Special Late Bonus Edition!
A recent trip to HPB (15% coupon firmly in hand) found the two above books: a Zelazny I had never heard of (which worked out well last time when I found Changeling) and the Dungeoneer's Survival Guide. I didn't have the latter back during my AD&D days, and it was a good deal to expand my collection. It also may provide some inspiration for Undermountain in my Swords & Wizardry in Waterdeep campaign.
Happy hunting, bibliophiles, and may all your Tuesdays be tomeful.